66448907 has 16 divisors (see below), whose sum is σ = 77753280. Its totient is φ = 55613952.

The previous prime is 66448853. The next prime is 66448919. The reversal of 66448907 is 70984466.

It is a cyclic number.

It is not a de Polignac number, because 66448907 - 2¹⁶ = 66383371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66448957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55103 + ... + 56295.

It is an arithmetic number, because the mean of its divisors is an integer number (4859580).

Almost surely, 2^66448907 is an apocalyptic number.

66448907 is a deficient number, since it is larger than the sum of its proper divisors (11304373).

66448907 is a wasteful number, since it uses less digits than its factorization.

66448907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66448907 is about 8151.6199003634. The cubic root of 66448907 is about 405.0381653817.

It can be divided in two parts, 6644 and 8907, that added together give a palindrome (15551).

The spelling of 66448907 in words is "sixty-six million, four hundred forty-eight thousand, nine hundred seven".